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聚乙二醇辅助溶胶-凝胶法制备 Cu-Zn-Al 双功能催化剂的结构和催化性能
引用本文:樊金串,黄伟,吴世建.聚乙二醇辅助溶胶-凝胶法制备 Cu-Zn-Al 双功能催化剂的结构和催化性能[J].催化学报,2011,32(1):139-143.
作者姓名:樊金串  黄伟  吴世建
作者单位:1太原理工大学化学化工学院, 山西太原 030024; 2太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原 030024
基金项目:国家重点基础研究发展计划(973计划,国家自然科学基金,山西省自然科学基金
摘    要: 在聚乙二醇 (PEG) 辅助下, 用溶胶-凝胶法制备了一系列 Cu-Zn-Al 双功能催化剂, 采用 X 射线粉末衍射、N2 吸附、X 射线光电子能谱、H2 程序升温还原和 NH3 程序升温脱附等方法对催化剂进行了表征, 并将催化剂用于浆态床合成气一步法制二甲醚反应中, 考察了 PEG 用量对催化剂性能的影响. 结果表明, PEG 的添加可改善催化剂的织构性质和表面性质, 进而提高催化剂活性. 随着 PEG 用量增加, 催化剂比表面积、孔体积和孔径逐渐增大, 还原温度先降低后升高, 活性组分分散度、表面 Cu 含量和表面强酸量先增加后减少. 然而, PEG 的添加仅能提高催化剂上制二甲醚反应的活性和选择性, 对催化剂稳定性没有影响.

关 键 词:聚乙二醇        溶胶-凝胶法  合成气  二甲醚
收稿时间:2010-06-30

Preparation of Cu-Zn-Al Bifunctional Catalyst by Sol-Gel Method with the Assistance of PEG and Its Catalytic Performance
FAN Jinchuan,HUANG Wei,WU Shijian.Preparation of Cu-Zn-Al Bifunctional Catalyst by Sol-Gel Method with the Assistance of PEG and Its Catalytic Performance[J].Chinese Journal of Catalysis,2011,32(1):139-143.
Authors:FAN Jinchuan  HUANG Wei  WU Shijian
Institution:1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China; 2Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
Abstract:A series of Cu-Zn-Al catalyst samples were prepared by sol-gel method with the assistance of polyethylene glycol (PEG) additive. The effect of PEG dosage on their physical and chemical properties was characterized by X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, and NH3 temperature-programmed desorption. The catalytic performance of the catalyst for direct dimethyl ether (DME) synthesis from syngas was evaluated in a slurry reactor. The results showed that PEG can improve the texture and surface physical and chemical properties of the catalyst and therefore enhance its catalytic activity. With the increase of PEG dosage, the specific surface area, pore volume, and pore diameter of the catalyst increased, whereas the reduction temperature decreased first and then increased, and the dispersion of active component, surface Cu content, and strong acid amount first increased and then decreased. However, adding PEG can only enhance catalytic activity and selectivity of the catalyst, but has no effect on the catalyst stability.
Keywords:polyethylene glycol  copper  zinc  aluminium  sol-gel  syngas  dimethyl ether
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